Katy Perry has chosen a wedding gown which will show off her toned stomach.

The 'I Kissed A Girl' singer has reportedly opted for a less-than-conventional two-piece outfit to wear when she ties the knot with British funnyman Russell Brand and has been collaborating with designers Pnina Tornai and Monique Lhuillier to create her dream image.

A source told this week's heat magazine: "She knows her toned torso is her best feature, so she wants to show it off. She's also more than aware that her wedding photos will be seen the world over, so she knows her look needs to stand out. From the back, she wants to look like a traditional bride, with a very long train, but from the front, she wants a Vegas-style sequinned number with exposed skin."

While Katy knows what she wants to wear for her nuptials, she and Russell are still undecided as to where the ceremony will take place.

The source said: "Katy just wants to be married already. She's angling for an over-the-top elopement in Las Vegas. Russell wants to fly everyone someplace exotic, either a Gothic castle or a destination with an Arabian feel."

Despite Katy recently admitting Russell is "obsessed" with bridal magazines, he insists he doesn't want to be heavily involved in planning their wedding.

The comic star - who got engaged to the pop beauty in December after three months of dating - said: "Women are in charge. When you get married, you don't let your husband decide. He'll be an idiot!"